Survey
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Uncertainties for which sampling is required (i.e., to be incorporated into Work Plan). Area Uncertainty Resolution/ Type of info required Responsibility A What is the extent of Excavate, use Soil samples for COC list: DRO/RRO, contamination at Area confirmation samples PCBs, VOCs A? to delineate Plan to cleanup to Method Two B C Groundwater samples for COCs that exceed Method Two levels. Landfill boundaries If groundwater encountered before excavation is complete Survey landfill Are there groundwater releases via seeps from Area B/landfill? Visual inspection to determine possible seeps Field visual If choose to remediate Area C, what is the extent of remediation required? Extent of soil above Method Two and TSCA levels Determination if groundwater is impacted at site Survey If found, sample discovered seep; likely full suite required due to landfill Additional soil data for PCBs, DRO/RRO, VOCs either prior to or during removal If sampling conducted prior to removal, need to delineate vertically to groundwater /bedrock Visual evidence of seeps/evaluation of existing data to determine flow pathways Based on this, groundwater samples Quality Quantity Priority Area Uncertainty Resolution/ Responsibility Type of info required may be needed for PCBs, VOCs Quality Quantity Priority Veh. Maint Yard If relinquishing, what is Extent of soil above the extent of soil POL Method Two contamination for UST area? Determination if groundwater is impacted at site Has area west of drum storage area been impacted? WAC Survey WAC landfill If AF is planning to dispose of the land, what is extent of soil contamination? Determine presence of COCs above Method Two levels. Extent of soil above Method Two Additional soil data for DRO, RRO, GRO, BTEX, PAHs either prior to or during removal. If sampling conducted prior to removal, need to delineate vertically to groundwater /bedrock Visual evidence of seeps/evaluation of existing data to determine flow pathways Minimum one groundwater sample at UST source location for DRO, RRO, GRO, BTEX, PAHs. Based on the sample result and groundwater understanding, additional groundwater samples may be needed for found COCs. Soil sampling for PCBs, DRO, VOCs using multi-incremental strategy to groundwater/ bedrock; refine spacing as needed based dynamically. Additional soil data for PCBs, DRO, RRO, BTEX. (PAHs need to be included w/ DRO sampling where sites are being newly characterized) PCBs to be sampled multi-incrementally Determination if groundwater is impacted at site LPH Is there likelihood for contamination being left in place? Determine if any subsurface infrastructure remains and likelihood of contamination If sampling conducted prior to removal, need to delineate vertically to groundwater /bedrock Visual evidence of seeps/evaluation of existing data to determine flow pathways Based on groundwater understanding, additional groundwater samples may be needed for found COCs. Subsurface survey to determine presence of graded over tanks or structures. Follow on action could include subsurface soil sampling